Punching mechanism for paper webs



July 22, 1952 w. E. OLIVER 2,604,167

PUNCHING MECHANISM FOR PAPER WEBS Filed Nov. 2, 1950 F/VGJ I F/G.2

l0 i 7 x5 '2 x vIIVVEIVTOR 9 "Al. TER E. OLIVER T *M r' Patented July 22, 1952 UNITED STATES PATENT OFFICE PUNCHING MECHANISM FOR PAPER WEBS Walter E. Oliver, Quincy, Mass.

Application November 2, 1950, Serial N 0. 193,656

1 Claim. 1

This invention relates to paper punching mechanism for paper or like thin material and the object is to provide a construction capable of rapid operation, and one wherein the punchings will be cleanly severed. While not limited thereto, the construction has found a particular and successful application in the production of forms for autographic registers and the like where long webs or strips of paper are provided at intervals, with holes which provide for the proper feeding of the strips through a register, typewriter or the like, and the registry in such a machine of superposed sections of strip. A standard size for such holes is in diameter.

My invention will be well understood from the following description taken in connection with the accompanying drawings, wherein:

Fig. 1 is an end view of a pair of punching rolls;

Fig. 2 is a fragmentary side view partly in section of the rolls;

Fig. 3 is an enlarged sectional view on line 3-3 of Fig. 1; and

Fig. 4 is a section of the die alone.

In punching long webs of paper at regularly spaced intervals it is convenient to pass a Web or superposed webs through the bite of a pair of punching rolls as shown more or less schematically in Fig. 1, comprising an upp r roll l0, having fixed punches l2 projecting radially therefrom at intervals around the circumference, which punches roll into the openings of suitable dies H in a cooperating roll [6. The path of the work 10 is tangent to the face of the lower roll i6 and the punching operation occurs substantially at the circumferential surface of that roll. It will be apparent that since the punch passes through the paper an exact theoretical operation at the pitch line is not in fact possible. It will also be apparent that when the punch moves down in a curvilinear path from the left in Fig. 1, it enters the female die at its leading edge and then makes a out which gradually follows around the die opening toward the transverse diameter of the latter as the two punching elements approach vertical alignment, as shown 7 having a fixed punch 12 which projects radially therefrom and which is adapted to roll into the die opening I4, the cutting edge of which is disposed substantially flush with the face of the lower roll I6. The female die [4 is of novel form. The cutting edge of the die I at its distal end,

as best seen in Fig. 4, has a suitable clearance provided by the outwardly and proximally flaring surface [8. The area of the die opening is then contracted through an inwardly and proximally flaring surface 20 to a bore 22 of substantial length, the cross sectional area, b, of which bore is slightly less than that, a, of the cutting edge of the die, this bore being open at its proximal end to permit the discharge of punchings therefrom. By way of example, and without limitation to these exact figures, I may say that in the application of my invention to the production of register supplies, I have had good results with a die having an opening .375 inch in diameter, the dimension a in Fig. 4, wherein the diameter of the bore 20 was .372, the dimension 1) in Fig. 4. As a punching 2 is severed from the work w it falls to the distal end of the bore, but being somewhat larger, it cannot pass freely therethrough. A stack of punchings thus accumulates in the die cavity, as shown in Fig. 3, and this stack is then pushed gradually down through the opening 20, the stack being retarded by friction and pressure on its edges so that it sustains the punching which is in the process of being severed substantially at the cutting edge of the die to insure its being cut cleanly throughout the periphery of the edge.

I am aware that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive, as is in fact clear in several matters from the description itself. Reference is to be had to the appended claim to indicate those principles of the invention exemplified by the particular embodiment described and which I desire to secure by Letters Patent.

I claim:

Punching mechanism for paper and the like. comprising a male punch and a female die having an opening therethrough which successively comprises an edge portion at its distal end, an outwardly and proximally flaring portion providing a clearance for the edge, an inwardly and proximally flaring portion and a straight-sided portion of uniform cross section and encompassing a cross sectional area slightly less than that encompassed by said edge, all said portions being organized about a common axis and providing for the retardation in said straight-sided portion of a stack of severed punchings which sustains at the edge the punching being severed.

WALTER E. OLIVER.

REFERENCES CITED UNITED STATES PATENTS Name Date Dickerman Aug. 2, 1M9

Number Be. 23,138 

